[amsat-bb] Re: Cubesat 1 axis attitude control?

Colin Hurst cjhurst at bigpond.net.au
Thu Feb 20 16:12:44 PST 2014

I am not a rocket scientist but may qualify as a greybeard.
Have been an ardent follower of satellite attitudes for many years.
I would have thought that passive magnetic stabilisation would have been the
preferred option to meet your objective.

In principle your idea should work, however you would need some smart
processing on board as the Earth's Main Field inclination does not follow
the equator.
The only concern I would envisage is that if the magnetic coil is not
triggered precisely relative to the earth's magnetic field you may flip the
satellite and negate your objective.
Eastern Hemisphere passes should not present a timing issue but the Western
Hemisphere (over the Americas) may present a real timing issue thus

Just my two bobs worth.
Colin VK5HI.

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Robert Bruninga
Sent: Friday, 21 February 2014 07:58
To: amsat-bb at amsat.org
Subject: [amsat-bb] Cubesat 1 axis attitude control?

Need an AMSAT greybeard with attitude control experience.

We want to use only one magnetorguer coil (a Z coil) to more or less keep
our Z axis aligned with the Earth's axis (+/-30 deg)

We figure if we energize the Z coil only twice per orbit while over the
equator where the Earth's magnetic field is aligned with the poles we can
eventually bring it into alignment.  Then we maintain that alignment using
white/black differential solar radiation pressure to maintain a fractional
RPM about the Z axis.

I need help from some greybeards to prove this is possible.

Bob, WB4aPR
Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list